About a year ago they stop solely relaying on GCM and also use WebSocket.
I don’t see LibreSignal available on Eutopia’s F-Droid repository.
Notice that they have the APK available on their website.
For the record, Copperhead repo has a rebrand called Noise available
YES! that’s good news. Every rebrand will make a favor to Signal (what a dumb name!)
Remember: the non inclusion of Signal on our repository it’s just a personal decision of the main developer.